... Support encryption: RC4, VOS etc.l Support Hotline, Phone book, Speed dial, Dial Planl Update firmware by local ... according to its balance, balance alarml Centralized network managementl Caller ID detection and generationl Master and slave SIP serverl SIM ... compatibleTelephony Features- Hot-line call- Dial plan- Speed dial- Phone book- CDR- White listTelephony Signaling- DTMF tone detection/generation- ...